Application - DS1302, RTC module：修訂間差異

2026年8月23日 (日) 17:56的最新修訂

Adding a DS1302 real-time clock module to a Raspberry Pi so it keeps time without a network connection.

Hardware

In version 2 Pi GPIO27 is in place of GPIO21 (same pin)

Software

Real Time Clock Source Code

 Modify the following GPIO definition for RPi 2
 #define GPIO_ADD 0x20200000L                          ->  #define GPIO_ADD 0x3F000000L
 #define SCLK_OUTPUT *(gpio+GPIO_SEL2) &= 0xFFFFFFC7L  ->  #define SCLK_OUTPUT *(gpio+GPIO_SEL2) &= 0xFF1FFFFFL
 #define SCLK_HIGH *(gpio+GPIO_SET) = 0x00200000L      ->  #define SCLK_HIGH *(gpio+GPIO_SET) = 0x08000000L
 #define SCLK_LOW *(gpio+GPIO_CLR) = 0x00200000L       ->  #define SCLK_LOW *(gpio+GPIO_CLR) = 0x08000000L

Reference

Raspberry Pi Real Time Clock

@@ 第1行： / 第1行： @@
+Adding a '''DS1302''' real-time clock module to a Raspberry Pi so it keeps time without a network connection.
 [[File:Rpi rtc.jpg|border|400px]]
 == Hardware ==